<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>编写四则运算</title>
</head>
<body>
<input name="btn" type="button" value="计算两数运算结果" onclick="account();" />
<script type="text/javascript">
    function account()
    {
        
    }
</script>
</body>
</html>